Photoluminescence and energy transfer in transparent glass-ceramics based on GdF3:RE3+（RE=Tb,Eu）nanocrystals
来源期刊：Journal of Rare Earths2019年第11期
论文作者：Natalia Pawlik Barbara Szpikowska-Sroka Ewa Pietrasik Tomasz Goryczka Wojciech A.Pisarski
文章页码：1137 - 1144
摘 要：In the present work,the transparent oxyfluoride glass-ceramic samples containing GdF3:RE3+（RE=Tb,Eu） nanocrystals（nGCs） were fabricated via controlled heat-treatment of precursor xerogels prepared using a sol-gel method.The formation of GdF3 nanocrystalline phase from gadolinium（III） trifluoroacetate was verified based on XRD measurements.The average crystal sizes calculated from Scherrer formula were estimated to～10 nm as well as～6 nm for Tb3+-and Eu3+-doped samples,respectively.The optical behavior of prepared sol-gel samples was evaluated based on photoluminescence excitation（PLE） and emission spectra（PL） as well as luminescence decay analysis.Obtained samples exhibit the 5D4→7FJ(J=6-3,Tb3+)and the 5D0→7FJ(J=0-4,Eu3+) emission bands recorded within the visible spectral area under excitation at near-UV(393 nm(Eu3+),351,369,378 nm(Tb3+)) as well as middle-UV illumination(273 nm(Gd3+)).Additionally,based on recorded decay curves,the luminescence lifetimes（τm） for the 5D4（Tb3+） and the 5D0(Eu3+)excited states were also evaluated.In general,recorded luminescence spectra and double-exponential character of decay curves for nGCs indicate a successful migration of Tb3+ and Eu3+ dopant ions from amorphous silicate framework to lowphonon energy GdF3 nanocrystal phase.
Natalia Pawlik1，Barbara Szpikowska-Sroka1，Ewa Pietrasik1，Tomasz Goryczka2，Wojciech A.Pisarski1
1. Institute of Chemistry,University of Silesia2. Institute of Materials Science,University of Silesia
摘 要：In the present work,the transparent oxyfluoride glass-ceramic samples containing GdF3:RE3+（RE=Tb,Eu） nanocrystals（nGCs） were fabricated via controlled heat-treatment of precursor xerogels prepared using a sol-gel method.The formation of GdF3 nanocrystalline phase from gadolinium（III） trifluoroacetate was verified based on XRD measurements.The average crystal sizes calculated from Scherrer formula were estimated to～10 nm as well as～6 nm for Tb3+-and Eu3+-doped samples,respectively.The optical behavior of prepared sol-gel samples was evaluated based on photoluminescence excitation（PLE） and emission spectra（PL） as well as luminescence decay analysis.Obtained samples exhibit the 5D4→7FJ(J=6-3,Tb3+)and the 5D0→7FJ(J=0-4,Eu3+) emission bands recorded within the visible spectral area under excitation at near-UV(393 nm(Eu3+),351,369,378 nm(Tb3+)) as well as middle-UV illumination(273 nm(Gd3+)).Additionally,based on recorded decay curves,the luminescence lifetimes（τm） for the 5D4（Tb3+） and the 5D0(Eu3+)excited states were also evaluated.In general,recorded luminescence spectra and double-exponential character of decay curves for nGCs indicate a successful migration of Tb3+ and Eu3+ dopant ions from amorphous silicate framework to lowphonon energy GdF3 nanocrystal phase.
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